BTS remains open except for the Office of Airline Information, which is closed and not accepting data submissions due to an appropriations lapse.All BTS releases, except the Transportation Services Index, will be delayed.

1985-14: U.S. Department of Transportation, Federal Transit Administration, National Transit Database (Washington, DC: Annual reports), table 25 and similar tables in earlier editions, available at http://www.ntdprogram.gov/ntdprogram/ as of May 5, 2016.